/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxElbowEdgeHandler
 *
 * Graph event handler that reconnects edges and modifies control points and
 * the edge label location. Uses <mxTerminalMarker> for finding and
 * highlighting new source and target vertices. This handler is automatically
 * created in <mxGraph.createHandler>. It extends <mxEdgeHandler>.
 *
 * Constructor: mxEdgeHandler
 *
 * Constructs an edge handler for the specified <mxCellState>.
 *
 * Parameters:
 *
 * state - <mxCellState> of the cell to be modified.
 */
function mxElbowEdgeHandler(state)
{
    mxEdgeHandler.call(this, state);
};

/**
 * Extends mxEdgeHandler.
 */
mxUtils.extend(mxElbowEdgeHandler, mxEdgeHandler);

/**
 * Specifies if a double click on the middle handle should call
 * <mxGraph.flipEdge>. Default is true.
 */
mxElbowEdgeHandler.prototype.flipEnabled = true;

/**
 * Variable: doubleClickOrientationResource
 *
 * Specifies the resource key for the tooltip to be displayed on the single
 * control point for routed edges. If the resource for this key does not
 * exist then the value is used as the error message. Default is
 * 'doubleClickOrientation'.
 */
mxElbowEdgeHandler.prototype.doubleClickOrientationResource =
    (mxClient.language != 'none') ? 'doubleClickOrientation' : '';

/**
 * Function: createBends
 *
 * Overrides <mxEdgeHandler.createBends> to create custom bends.
 */
mxElbowEdgeHandler.prototype.createBends = function()
{
    var bends = [];

    // Source
    var bend = this.createHandleShape(0);
    this.initBend(bend);
    bend.setCursor(mxConstants.CURSOR_TERMINAL_HANDLE);
    bends.push(bend);

    // Virtual
    bends.push(this.createVirtualBend(mxUtils.bind(this, function(evt)
    {
        if (!mxEvent.isConsumed(evt) && this.flipEnabled)
        {
            this.graph.flipEdge(this.state.cell, evt);
            mxEvent.consume(evt);
        }
    })));

    this.points.push(new mxPoint(0,0));

    // Target
    bend = this.createHandleShape(2);
    this.initBend(bend);
    bend.setCursor(mxConstants.CURSOR_TERMINAL_HANDLE);
    bends.push(bend);

    return bends;
};

/**
 * Function: createVirtualBend
 *
 * Creates a virtual bend that supports double clicking and calls
 * <mxGraph.flipEdge>.
 */
mxElbowEdgeHandler.prototype.createVirtualBend = function(dblClickHandler)
{
    var bend = this.createHandleShape();
    this.initBend(bend, dblClickHandler);

    bend.setCursor(this.getCursorForBend());

    if (!this.graph.isCellBendable(this.state.cell))
    {
        bend.node.style.display = 'none';
    }

    return bend;
};

/**
 * Function: getCursorForBend
 *
 * Returns the cursor to be used for the bend.
 */
mxElbowEdgeHandler.prototype.getCursorForBend = function()
{
    return (this.state.style[mxConstants.STYLE_EDGE] == mxEdgeStyle.TopToBottom ||
        this.state.style[mxConstants.STYLE_EDGE] == mxConstants.EDGESTYLE_TOPTOBOTTOM ||
        ((this.state.style[mxConstants.STYLE_EDGE] == mxEdgeStyle.ElbowConnector ||
            this.state.style[mxConstants.STYLE_EDGE] == mxConstants.EDGESTYLE_ELBOW)&&
            this.state.style[mxConstants.STYLE_ELBOW] == mxConstants.ELBOW_VERTICAL)) ?
        'row-resize' : 'col-resize';
};

/**
 * Function: getTooltipForNode
 *
 * Returns the tooltip for the given node.
 */
mxElbowEdgeHandler.prototype.getTooltipForNode = function(node)
{
    var tip = null;

    if (this.bends != null && this.bends[1] != null && (node == this.bends[1].node ||
        node.parentNode == this.bends[1].node))
    {
        tip = this.doubleClickOrientationResource;
        tip = mxResources.get(tip) || tip; // translate
    }

    return tip;
};

/**
 * Function: convertPoint
 *
 * Converts the given point in-place from screen to unscaled, untranslated
 * graph coordinates and applies the grid.
 *
 * Parameters:
 *
 * point - <mxPoint> to be converted.
 * gridEnabled - Boolean that specifies if the grid should be applied.
 */
mxElbowEdgeHandler.prototype.convertPoint = function(point, gridEnabled)
{
    var scale = this.graph.getView().getScale();
    var tr = this.graph.getView().getTranslate();
    var origin = this.state.origin;

    if (gridEnabled)
    {
        point.x = this.graph.snap(point.x);
        point.y = this.graph.snap(point.y);
    }

    point.x = Math.round(point.x / scale - tr.x - origin.x);
    point.y = Math.round(point.y / scale - tr.y - origin.y);

    return point;
};

/**
 * Function: redrawInnerBends
 *
 * Updates and redraws the inner bends.
 *
 * Parameters:
 *
 * p0 - <mxPoint> that represents the location of the first point.
 * pe - <mxPoint> that represents the location of the last point.
 */
mxElbowEdgeHandler.prototype.redrawInnerBends = function(p0, pe)
{
    var g = this.graph.getModel().getGeometry(this.state.cell);
    var pts = this.state.absolutePoints;
    var pt = null;

    // Keeps the virtual bend on the edge shape
    if (pts.length > 1)
    {
        p0 = pts[1];
        pe = pts[pts.length - 2];
    }
    else if (g.points != null && g.points.length > 0)
    {
        pt = pts[0];
    }

    if (pt == null)
    {
        pt = new mxPoint(p0.x + (pe.x - p0.x) / 2, p0.y + (pe.y - p0.y) / 2);
    }
    else
    {
        pt = new mxPoint(this.graph.getView().scale * (pt.x + this.graph.getView().translate.x + this.state.origin.x),
            this.graph.getView().scale * (pt.y + this.graph.getView().translate.y + this.state.origin.y));
    }

    // Makes handle slightly bigger if the yellow  label handle
    // exists and intersects this green handle
    var b = this.bends[1].bounds;
    var w = b.width;
    var h = b.height;
    var bounds = new mxRectangle(Math.round(pt.x - w / 2), Math.round(pt.y - h / 2), w, h);

    if (this.manageLabelHandle)
    {
        this.checkLabelHandle(bounds);
    }
    else if (this.handleImage == null && this.labelShape.visible && mxUtils.intersects(bounds, this.labelShape.bounds))
    {
        w = mxConstants.HANDLE_SIZE + 3;
        h = mxConstants.HANDLE_SIZE + 3;
        bounds = new mxRectangle(Math.floor(pt.x - w / 2), Math.floor(pt.y - h / 2), w, h);
    }

    this.bends[1].bounds = bounds;
    this.bends[1].redraw();

    if (this.manageLabelHandle)
    {
        this.checkLabelHandle(this.bends[1].bounds);
    }
};
